Question about Mitsubishi WS-65807 65" Rear Projection Television

8 Answers

Mits WS-65807 shows no sign of life

I picked up this set from a friend after it had died on him. I can hear some kind of power-up sound just after plugging in the set. There is no green light (blinking or otherwise) to look at.
I have downloaded the service manual for this set. It states that the microprocessor is not functioning if the green light does not flash.
After looking at several forums, it seems like a power supply issue. What is the "power supply"? Is it an entire board, board section, or what? I would like to determine the root cause of this failure before deciding if I will try to fix it.

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  • kateslilsis Jan 04, 2009

    I put an ohm meter across the two small fuses on the center boart that apparently work with the ICs. They both showed less than an ohm of resistance. This makes me think ther fuses are OK. I would like to know how to determine if power is getting to some of the main components. How might I do this?

  • kateslilsis Jan 05, 2009

    The center board has a large heat sink with the ICs on it. Is there some way I can determine if they are working? Also, when I plug in the set I hear a soft chirp. When it is unplugged, after a couple of seconds, I hear the chirp again. Can this sound be used to get a sense of some part of the board powering up and down?

  • kateslilsis Jan 27, 2009

    What is the best way to test the power supply? Since there are several voltages coming out of the power supply, how can I test to see if the voltage to the microprocessor is correct or even present?

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You can use a volt or ohm meter by placing the positive and negative probes to you wires. If you get a reading then you will have power. The power supply converts your household 120 volts of electricity down to around 12 + volts. This is how almost all electronics work. the power supply can become defective throughout time causing too high of a voltage or not enough voltage.

To test fuses, resistors, relays, or other components, I suggest using an ohmeter. This meter when set on the ohm/resistance setting can measure the resistance inside a closed component. Example: If you take a bus fuse, you place one probe on on end of the fuse, and the other probe on the other end of the fuse. If the fuse is good you will get a reading. If not, you then you wont.

Posted on Jan 27, 2009

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You need to order a service manual and schematic for the set. I bought one for my 65511 several years back.

Also check on alt.sci.electronics and anatek.com. I've fixed several sets based on infomration gained from these sights, to the point that they told me what resistor to replace.

Posted on Jan 27, 2009

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Just my two cents worth... the fuses have to be removed from the circuit to be tested properly

Posted on Jan 05, 2009

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  • Master
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The power supply is going to be where the power cord runs into the back of the tv. it should be a small board that will unplug from the set itself. it shouldnt run more than 100.00 to fix

Posted on Jan 04, 2009

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Hi and welcome to FixYa,

Initially:

  • completely dead, no green light, some kind of power-up sound;
  • you suspect the power supply.
A couple of ideas:
  • you have to reference the service manual. It will have both a schematic and parts placement diagram;
  • the simplest way to determine where the power supply is, follow the AC power cord until it reaches electronic components. Normally, it would be a fuse, some filters, a bridge diode then capacitor (large);
  • a completely dead with powering sound but failing is indicative that electric power is reaching the inside;
  • most likely no fuse is blown;
  • most likely no standby +5VDC that supplies the logic controller including the "microprocessor". This would also be part of the output of the PSU (power supply unit);
  • therefore, no error code since protection and built-in diagnostics will not even run.
Good luck and Thank you for using FixYa.

Posted on Jan 04, 2009

  • Louie  Role
    Louie Role Jan 28, 2009

    Hi again and appreciate the postback/update.

    If you are going for board replacement, most Mitsubishi PTV boards are NLA (no longer available). What are on the markets are refurbished or pull outs.

    As initially posted, what must first be determine is for the presence/absence of the +5VDC standby voltage. Without this existing, any or all other voltages will not kick in when you power on.

    This of course would require perform voltage measurements,determine faulty component and subsequent part(s) replacement. Further, a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron would be required. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings.Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.


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In the particular model of yours it has a different power supply board just besides your main board.

Posted on Jan 04, 2009

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Power supply usually refers to either a board or the transformer. If the power supply transformer is on a seperate board that the main processor then it is easy enough to replace.  If it is part of the main board then that is what you are replacing.  The powersupply will be connected to the wire that gos out the back of the tv and plugs into the wall.

Posted on Jan 04, 2009

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  • Mitsubishi Master
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The power supply is the board that provide DC power to the unit.

If there is no power at all the PSU board is faulty.

Posted on Jan 04, 2009

  • Ginko
    Ginko Jan 04, 2009

    The PSU is a board that can be replaced , for safety resons the replacement must be done by a technician.




  • Ginko
    Ginko Jan 04, 2009

    To order a replacement power board for the model call mitsubishi parts at 1-800-553-7278, and give them the model number printed on the TV service plate.




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